Commutator-dressing apparatus



Oct. 30 1923.

W. H. JORDAN COMMUTATOR DRESSING APPARATUS Filed Sept. 17. 1921 momm SPatented a. 30,1923.

UNTTED STATES PATENT Lewd? WILLIAM H. JORDAN, OF BROOKLYN, NEW YORK,ASSIGNOR O ONE-HALF TO CHRIS- TOPHER C. JORDAN, OF NEW YORK,

COMMUTATOR-DRESSING APPARATUS.

' Application filed September 17, 1921.

a To all whom it mag concern.

Be itknown that I, WILLIAM H. JORDAN,

a citizen of the United States, and a resident of the borough ofBrooklyn, county of Kings, city and State of New York, have invented acertain new and useful Commutator-Dressing Apparatus, of which thefollowing is a specification.

The invention relates to an apparatus for removing the strips ofinsulation from be tween the metallic bars of a commutator withoutdismantling the motor, or generator,

of which the commutator forms a part, and is particularly designed 'forremoving said 15 insulating strips in part preparatory to grinding thecommutator to true the same.

r en a commutatorbecomes untrue due to uneven wear of the bars caused bythe engagement of the brushes,

breaking down ofthe edges of the commutator bars, the usual practice isto grind the commutator without removing the armature from the machine.

In the grinding operation the insulation 2 surface of the commutator,and in many 1 cases it is not attacked by the grinding wheel or disc,but remains standing above the new 730 surfaces of the bars and preventsthe same from being ground to true cylindrical form. The projectinginsulation also prevents good contact of the brushes with the commutatorand the latter sparking and to blows given to it in its passage underthe brushes.

The objects of the present invention are to provide a device which ischeap to conich will not easily get out of order; which is simple tooperate; by means of which the insulation, is desired which may bequickly and cleanly removed from between the commutator bars withoutinjury to the latter; by means of which the'depth to which theinsulation i removed may be regulated; which may be guided in itspassage along the commutator, and in which the guiding means may beadjusted to suit commutator bars of different width. V

These and further objects will more fully appear in the followingspecification and accompanying drawings considered together orseparately.

5 7 One embodiment'of the invention is illusor by pitting or ofpreferably integral with the quickly becomes worn due to or as muchthereof as Serial No. 501,442.

trated in the accompanying drawings in which like parts in all of theseveral figures are designated by corresponding characters of reference,and in which Fig. 1 is a side elevation of an apparatus embodying theinvention.

Fig. 2 is anend elevation of the same.

Fig. 3 is a top plan view of the same illustrating one form of drivingmeans.

' *ig. 4 is a section on the line 4-4- of Fig. 3, and V Fig. 5 is a formof drive. 7

In the embodiment of the invention illustrated 1 designates a framehaving an elongated cylindrical bearing 2 at about its cen tral portion,said bearing having its outer periphery screw threaded as shown. Theframe is provided with a handle 3 arranged perpendicular to the bearing2.

Overhanging the bearing, and at opposite sides thereof are two top planview of a modified carriage l. The flange 4: is provided with two slots6 extend ing in the direction of the radial line of the bearing 2, andthe flange 5 is provided with two similar slots 7.

Threaded on the bearing 2 is a nut 8 ha ing a milled head 9 at itsouterextremity. The nut is provided with a shoulder 10, and a collar 11 issecured to the inner extremity of the nut. Journalled in the grooveformed between the shoulder 10 and the collar 11 is a carriage 12 havinga flange 13 projecting over the flange e of the frame 1, and a flange 14projecting under the flange 5. Each of the flanges 13'and leis providedwith a pair of perforations 15, and each perforation corresponds inposition with one of the slots 6 and 7. The slots 6 and 7, and the perforations 15 are so disposed relatively to the bearing 2 that two slotsand two bearings,

all in alinement, are disposed at dianietrically opposite sides of thebearing.

Xtending through the alined slots and perforations at each side of thebearing is a screwthreaded spindle 16each encircled =one' direction, andthe nut 18 acts as an ad an abutment for the spring 1'? of that *spindleand the opposite end flanges 4 and 5 justable stop for limiting 1Opposite side of the may be attaohedthereto.

bylthe handle 83.

' erab-lyi'ounded, and provided with a longi v y p trom 'one' slot'by IIn the modification shown in saw shaft 22 is provided with a-bevel gearA is as follower- 22,. the slots tend the movement of the spindle in theopposite direction. Secured to the lower ends of the spindles leis a bar20 having its loweredge pref v tudinal rib 21 also preferably rounded.

Mounted in the bearing 2 is a shaft 22 carrying at one end a circularsaw '23 secured in position by means of anut. 2a 101: otherwise. Theshaft 22 is provided, on the bearing with a coupling aeflex-ible-shatt26 The shaft 26 may be attached directly to'the armature shaft means ofwhich of amotor 27, but preferably it is driven from the commutator.shaftthrou'gh reduction gearing'28, as shown in Fig". 3.

Fig. 5 the 29 with ,whiclrengages abevel pinion 30" fast to the shaft 31ot a motor. 32carried The operation of the embodiment of the inventionillustrated in liligs. l,-,2, 3 and ---The 'mot'or 2'? is set up ata'convenient distance fromflthe machine the commutator V of which is tobe p r Bdbetween twoofthecommutator bars 35 r F30.

acted i011. =Theinsulation is removed to the desired depthbyany-suitable means.

The nut 8' -is now manipulated to move the carriage 12"long'itudinallyfof the shaft 7 permitting of such.

movemenn 'until "when the .rib 2l' of the" guide bar '20 is placed inaqslot formed insulation. 7

' tatorslot.

the insulation 34 the saw by the removal of over an uncut. strip of willbe directly 7 The handle '3-isf them grasped the operator the motor'isstarted,*and the-forward end of the rib 21 is placed in the-outerextremity ofthe more or less-open 'commu- The aparatus is now presseddown on the commutator until the flange 14 engages the nuts? 18 whichwill limit the -downward movement and determine the depth to whichthemoved by the saw;

insulation is. to be re- The device is now moved inward along thecylindrical surface'ot the commutator,

that it cannot enter the slotsand will prevent cutting of insulation totoo great a depth. 'The rib 2lacts to guide-the device in astraight-dine, and: therew'illbe'no danger of the saw injuring the barsof the commutator.

The rounded lower edge otthelguide block 20, and the rounded stormof-the' ,rib v21 Willi-permit of-propen-engagement w-iththe tops'ofthebars 35, and"with the open slots, notwithstanding the fact thatthebeen removed, ,in,

the guide always may be movedj I toward patent ,tion has been described,togetherwiththe apparatu justing the-regulating means for adjusting theregulating means.

from slots between commutator adapted to engage! the commutator saw; 23and-thespindles 16 are disposed at an angle to each other due tQ thedifference in the radial angles of. the slots of the commutator.

Vl 'en the insulation has: been removed thesaw; that slot becomes 7 theguideltor the guide bar, and the operation is repeatedvuntil theinsulation has part, from all of the commutator slots. Preferablythecommutator to be actedon isrotatedbetweenthe cutting operationstobring the slot to be acted on to the top. I

The depth iof cut ofthe sawis'ilimit ed by. the distance between thenuts :18 and the 89 flange 14, and said distance maybe reg- 'ulated b'screwin :the'nutstoward or awa from the flange.

As the bars of 'difierent'commutators dif- V fer in width the guide20r-must he adjustable 8 longitudinally oi the shaft 22in order that jenter an open slot whenythe -;saw :is in position rover a tilled slot.-.By rotating'the'nut 8 the guide may V -or"'away 'fromfth'e saw:whereby the device maybe-adjusted to 0perate on commutators ofvaryingwidth of --In accordance with the provisionsoif the i statutesthe principle; of the-inven s which is now considered to repre- V sentthe best embodiment thereof, but it is desired tohave it understood'thatthe-appa- ,ratus shown is merely illustrativafland that theiinventionmay}be. carried .out in other The invention having.been-described, what isclaimed andldesired to be secured by Letters Patent, is 1 i 1. A deviceor the character described. comprising a saw, means for driving; thesaw,,- cushioned means for regulating the depth ot'cut of the saw, andmeans for ad- V 2(A device of the character described. comprising acircular saw, means for ro-f c ating the-saw, cushioned means forregulating the-depth otcut ol'rth'e saw, and means v 3. A ideviceadaptedfto remove insulation bars, comprisinga c rcularsam means; forrotating:

'thegsaw, means engaging; a commutator bar for l miting the depth ofcutoii the between commutator bars, comprisinga circularsaw; jpower'=mca'ns"i'-or rotating the saw, said saw being manually movablelon:

gitudinally of the commutator; an element tor lim iting the depth of cutof the saw, and means carried by the element for engaging a slotparallel to that engaged by the saw for guiding the sa-w'in its travelover the con1- mutator. V

5. A device of the character described, COIZ'lPl'lSlDg a power drivencircular saw mounted on a shaft and adapted to remove, partially atleast, a strip of insulation between two bars of a commutator, a bearingon the device, said shaft rotating in the bearing, a nut on the bearing,a carriage engaging the nut, the latter being rotatable relatively tothe former, movable spindles carried by the carriage, springs on thespindles, nuts on the spindles for limiting the movement of the spindlesin one direction, nuts on the spindles for limiting the movement thereofin the opposite direction, a guide bar carried by the spindles andlongitudinal rib on the guide bar.

6. A device for removing insulation between bars of a commutator,comprising a. circular saw and means for rotating the the same,adjustable, spring cushioned means engaging a commutator bar for lin1-iting the depth of cut of the saw, said limiting means being adjustabletoward and away from the saw.

This specification signed and witnessed this 16th day of September,1921,

WILLIAM H. JORDAN.

